/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.lucene.queries.intervals; import java.io.IOException; import org.apache.lucene.search.DocIdSetIterator; import org.apache.lucene.search.Scorer; import org.apache.lucene.search.TwoPhaseIterator; import org.apache.lucene.search.Weight; import org.apache.lucene.search.similarities.Similarity; class IntervalScorer extends Scorer { private final IntervalIterator intervals; private final Similarity.SimScorer simScorer; private final float boost; private final int minExtent; private float freq; private int lastScoredDoc = -1; IntervalScorer(Weight weight, IntervalIterator intervals, int minExtent, float boost, IntervalScoreFunction scoreFunction) { super(weight); this.intervals = intervals; this.minExtent = minExtent; this.boost = boost; this.simScorer = scoreFunction.scorer(boost); } @Override public int docID() { return intervals.docID(); } @Override public float score() throws IOException { ensureFreq(); return simScorer.score(freq, 1); } float freq() throws IOException { ensureFreq(); return freq; } private void ensureFreq() throws IOException { if (lastScoredDoc != docID()) { lastScoredDoc = docID(); freq = 0; do { int length = (intervals.end() - intervals.start() + 1); freq += 1.0 / Math.max(length - minExtent + 1, 1); } while (intervals.nextInterval() != IntervalIterator.NO_MORE_INTERVALS); } } @Override public DocIdSetIterator iterator() { return TwoPhaseIterator.asDocIdSetIterator(twoPhaseIterator()); } @Override public TwoPhaseIterator twoPhaseIterator() { return new TwoPhaseIterator(intervals) { @Override public boolean matches() throws IOException { return intervals.nextInterval() != IntervalIterator.NO_MORE_INTERVALS; } @Override public float matchCost() { return intervals.matchCost(); } }; } @Override public float getMaxScore(int upTo) { return boost; } }